P3 - Magnification and Power

Question 1

What do magnifying glasses produce?

Answer 1

A magnified virtual image.

Question 2

What is a disadvantage of virtual images?

Answer 2

You can’t project them onto a screen.

Question 3

What is the magnification formula?

Answer 3

Magnification = image height / object height.

Question 4

What does a powerful lens do?

Answer 4

Converges rays of light more strongly, so shortens the focal length.

Question 5

What is the power of a lens formula?

Answer 5

Power (D) = 1 / focal length (m).

Question 6

What is the power for a converging lens?

Answer 6

Positive.

Question 7

What is the power for a diverging lens?

Answer 7

Negative.

Question 8

What is the focal length of a lens determined by? [2].

Answer 8

1) the refractive index of the lens material.

2) the curvature of the lens surface.

Question 9

How do you make a more powerful lens?

Answer 9

By making it with lots of strongly curved surfaces.

Question 10

How can powerful lenses by made thinner?

Answer 10

By using materials with high refractive indexes.

Question 11

What lenses do magnifying glasses use?

Answer 11

Converging.